Excavating teeth



Aug. 4, 1925.

W. J. MULLALLY EXGAVATING TEETH Filed Aug. 2, 1923 7 J5 5@ @all Patented Aug. 4l, 1925.

UNITED STATES 1,54a374 PATENT Price.

WALTER JRMULLALLY, OF CHICAGO HEIGHTS, ILLINOIS, ASSIGNOR TO AMERICAN MANGANESE STEEL COMPANY, OF CHICAGO', ILLINOIS, A CORPORATION OF MAINE.

ExcAvATrNo TEETH. p

Application led August 2,4 1923. Serial No. 655,217.

T0 all whom t may concern:

Be it known that I, VAL'rER J.MULLALLY, a citizen of the United States, residing at Chicago Heights, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Excavating Teeth, of which the following is a specification.

This invention relates to teeth applied to excavating implements for the purpose of facilitating pene-tration into the material to be excavated, and particularly to teeth that are separately formed andy replaceably mounted upon the implement or upon a base member that is in turn mounted upon theimplement, either of which, for the purposes of the present invention, may be regarded as a base member upon which the penetrating member is mounted.

The object of the invention isto provide an improved construction of the means through which the penetrating member is assembled with the base mem er, and one in which stresses transmitted from the one member to the other will be distributed in a manner to avoid deteriorating strains upon each member. i s

In carrying out the invention, the members are constructed the one with a recess and the other with a shank mating `with said recess, the recess comprising two slots ex tending through from side to' side of the.

member in which it is formed (preferably the, penetrating member) in intersecting" .planes, while the shank comprises flanges intersecting in planes corresponding with those of the slots which form the recess, so that the members may be assembled by sliding one upon the other in the direction of the axis of penetration, and stresses which tend to delecteither member relatively to the other wedging loo-lts, important fractions of the deflecting stresses will be taken up by the wedging action of flanges and slots that are in the plane of the stress, and those flanges which are transverse to thedirection of stress supplemental recesses in the slotted member,

enter into `engagement with the outer walls of the slots in the several transverse directions and thus Itake up a lsubstantial' proportion of transverse stresses which would otherwise be. imposed in each instance mainly upon the flange intersecting the line of stress.

advantageous in an assembly involving wedgmg action of the intersecting flanges since the shoulders sustain the walls of the The shoulders which thus reinforce the connection are additionally` slotted member against spreading under the wedging action.

In the accompanying drawing, in which the preferred embodiment of the invention is shown by way of illustrationlFigure 1 is a longitudinal section through a penetrating lmember and va'portion of the base member in which theinvention is embodied, the'plane of section being indicated by the line lx--P in Figure 2.

Figure 2 is a side elevation of parts shown in 'Figure l, but in a direction at rightangles to the plane of Figure l.

Figure 3 is a section on'the line 3* Figures l and 2. s f

Figure 4 is a perspective viewshowing the two members of the assembly segregated.l

' l represent-s a base member such, for instance, as a tan through means of which" a tooth is attache to an excavating dipper or bucket, and 2 represents a separately formed penetrating member or tooth proper which is to be assembled with said base member through means constituting the subject-matter of the present invention.

As shown in Figure 4, base v member 1 is provided with intersecting flanges, 3, -3a and 4, .4, which are preferably` developed with seating faces 5 at an angle to the medial planes of the flanges; and the penetrating member 2 is provided with a correspond,- ingly formed recess comprising slots 6 and 7 extendin through the` member-from side to side an intersecting in the same planes, and having walls with the same inclination as the flanges which form the shank. The members 1 and 2 are assembled by relative movement in the direction of the axis of penetration, and they are retained in assem- ,bled relation and drawn 'to a firm seating its base, parallel with but spaced from the flange which intersects its carrying flange,

I and these shoulders mate with supplemental l recesses l2 and 13 in the outer faces .of the slotted member, so that asl the members are drawn tightly together, tendency to spread A the walls of the slots by the wedgingl action is opposed in each'instance bythe appropriate shoulder. f

With a tooth assembly Vconstructed as above described, stresses-in lines intersect- -ing the axis of penetration will be taken up in every instance by at least two flange members intersected by said line, and also by one flange member parallel to said line and which tends to Wedge more tightly into its corresponding slot under4 such, stress. thermore, such stresses will be taken up not only by the slot walls on the sides -of the flanges from which-the stress proceeds, but also by slot walls on the remote sides of the flanges, whichare-in bearing upon the shoulders l0 or 11, and even that 'portion of the stress Whichisabsorbed by the Wedging action'of a flange parallel with the direction of stress will be; absorbed by 'the shoulders which` resist thespreading of the slot" Walls under such wedging action.

I claim: y

l. In an excavating implement, 'a base member, and a separately formed penetrating member mounted thereon; said membersy being constructed, the one with a recess and the other with a shank entering said recess; said recess comprising lslots in 'intersecting planes, each slot extending through the memberjfrom sideY to side, and said shank comprising flanges intersecltimg; in planes corresponding with those of the'slots and substantially coextensive with theslots both longitudinally and transversely.

2. In anexcavating implement, a base member, and a separately formed penetratv ymember, and a separately formed penetrating member mounted thereon; said members being constructed the one with a recess and the other with a shank entering said recess; said recess comprising slots in intersecting planes, each extendingthrough the member from side to side, and said shank comprising flanges intersecting in planesl corresponding with thoseV of the slots; said members also having, respectively, upon their flanges and the outer faces ofl their slot Walls, reinforcing shoulders and supplemental recesses mating with said shoulders and sustaining said outer Walls.

4. In an excavating implement, a base member, and a separately formed penetrating member mounted thereon; said mems bers being constructed the one' With a recess and the other with a shank entering said recess; said recess comprising slots in intersecting planes, each extending through the member 'from side to side, and said shank comprising flanges intersecting in planes corresponding with those of the slots; said 'members also having, respectively, upon their flanges and the outer faces of their slot walls, Y reinforcing shoulders and' supplemental recesses mating with said shoulders and sustaining said'outerv walls; and said shoulders being located near the bases of the flanges which carry them and each project-` ing substantially parallel With but at a distance from a flange intersecting the flange whichV carries it.

Signed at Chicago Hts., Illinois, this 19th day of July, 1923.

WALTER J. MULLALLY. 

